[al lkosmal]

I had a very similar occurance recently, except that it was clearly an electrical insulation, burning smell. It came and went, until finally smoke came rolling our from under the dash. I freaked out, stopped and it went away. I drove the final few blocks home and ....nothing. I checked under the dash and under the trunk/heating blower cover, engine compartment and no sign of burnt wiring. Eventually it happened again (smoke). This time I found the burnt wiring under the dash. The blue/black (on my 77S) from the headlight switch and provides 12V, unfused and daisy-chained to all the dash lights and ashtray light. It had shorted to ground, intermittently. Lot's of smoke and stink, but the wire itself showed only minor damage. I'd get out the wiring diagram and check that one out.